package com.example.week12_networkprogramming;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.util.List;
import java.util.Map;

public class GetPostUtil {
    /*
     * 向指定URL发送GET方法的请求
     * @param url 发送请求的URL
     * @param params 请求参数，请求参数应该是name1=value1&name2=value2的形式
     * @return URL 所代表远程资源的响应
     * */
    public static String sendGet(String url,String params){

        String result="";
        BufferedReader in=null;
        try {
            String urlName=url+"?"+params;
            URL realUrl=new URL(urlName);

            URLConnection conn=realUrl.openConnection();
            conn.setRequestProperty("accept","*/*");
            conn.setRequestProperty("connection","Keep-Alive");
            conn.setRequestProperty("user-agent","Mozilla/4.0(compatible;MSIE 6.0;Windows NT 5.1;SV1)");
            conn.connect();
            Map<String, List<String>>map=conn.getHeaderFields();
            for (String key:map.keySet()){
                System.out.println(key+"--->"+map.get(key));
            }
            in=new BufferedReader(new InputStreamReader(conn.getInputStream()));
            String line;
            while ((line=in.readLine())!=null){
                result+="\n"+line;
            }
        } catch (IOException e) {
            System.out.println("发送GET请求出现异常!"+e);
            e.printStackTrace();
        }
        finally {
            try {
                if (in!=null){
                    in.close();
                }

            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        return  result;

    }

    /*
     * 向指定URL发送POST方法的请求
     * @param url 发送请求的URL
     * @param params 请求参数，请求参数应该是name1=value1&name2=value2的形式
     * @return URL 所代表远程资源的响应
     * */
    public static String sendPost(String url,String params){

        PrintWriter out=null;
        BufferedReader in=null;
        String result="";
        try {
            URL realUrl=new URL(url);
            URLConnection conn=realUrl.openConnection();
            conn.setRequestProperty("accept","*/*");
            conn.setRequestProperty("connection","Keep-Alive");
            conn.setRequestProperty("user-agent","Mozilla/4.0(compatible;MSIE 6.0;Windows NT 5.1;SV1)");
            conn.setDoOutput(true);
            conn.setDoInput(true);
            out=new PrintWriter(conn.getOutputStream());
            out.print(params);
            out.flush();
            in=new BufferedReader(new InputStreamReader(conn.getInputStream()));
            String line;
            while ((line=in.readLine())!=null){
                result+="\n"+line;
            }

        } catch (Exception e) {
            System.out.println("发送POST请求出现异常！"+e);
            e.printStackTrace();
        }
        finally {
            try {
                if (out!=null){
                    out.close();
                }
                if (in!=null){
                    in.close();
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        return  result;
    }
}

